<template>
  <div class="app-container">
    <!-- 讲师表单 -->
    <el-form label-width="120px">
      <el-form-item label="讲师名称">
        <el-input v-model="teacher.name"/>
      </el-form-item>

      <el-form-item label="讲师头像">
        <!-- 头像缩略图 -->
        <pan-thumb :image="teacher.avatar"/>
        <!-- 文件上传按钮 -->
        <el-button type="primary" icon="el-icon-upload" @click="imagecropperShow=true">更换头像</el-button>
        <!--
v-show：是否显示上传组件
:key：类似于id，如果一个页面多个图片上传控件，可以做区分
:url：后台上传的url地址
@close：关闭上传组件
@crop-upload-success：上传成功后的回调 -->
        <image-cropper
          v-show="imagecropperShow"
          :width="300"
          :height="300"
          :key="imagecropperKey"
          :url="BASE_API + '/oss/file/upload'"
          field="file"
          @close="close"
          @crop-upload-success="cropSuccess"/>
      </el-form-item>

      <el-form-item label="讲师排序">
        <el-input-number v-model="teacher.sort" controls-position="right" min="0"/>
      </el-form-item>

      <el-form-item label="讲师头衔">
        <el-select v-model="teacher.level" clearable placeholder="请选择">
          <el-option :value="1" label="高级讲师"/>
          <el-option :value="2" label="首席讲师"/>
        </el-select>
      </el-form-item>

      <el-form-item label="讲师资历">
        <el-input v-model="teacher.career"/>
      </el-form-item>

      <el-form-item label="讲师简介">
        <el-input v-model="teacher.intro" :rows="10" type="textarea"/>
      </el-form-item>

      <el-form-item>
        <el-button :disabled="saveBtnDisabled" type="primary" @click="saveOrUpdate">保存</el-button>
      </el-form-item>
    </el-form>
  </div>
</template>
<script>
import teacher from '@/api/edu/teacher'
import ImageCropper from '@/components/ImageCropper'
import PanThumb from '@/components/PanThumb'

const defaultForm = {
  name: '',
  sort: 0,
  level: 1,
  career: '',
  intro: '',
  // 初始化头像默认上传地址
  avatar: process.env.OSS_PATH + '/avatar/default.jpg'
}

export default {
  // 声明引入的组件
  components: { ImageCropper, PanThumb },
  data() {
    return {
      teacher: defaultForm,
      saveBtnDisabled: false,
      BASE_API: process.env.BASE_API, // 接口api地址
      imagecropperShow: false, // 是否显示上传组件
      imagecropperKey: 0 // 上传组件id
    }
  },
  // 监听路由的变化，来决定表单的显示内容，因为新增和修改是共用的同一个表单
  watch: {
    $route(to, from) {
      this.init()
    }
  },

  created() {
    this.init()
  },

  methods: {
    init() {
      // 从路径判断id的值
      if (this.$route.params && this.$route.params.id) {
        const id = this.$route.params.id
        this.fetchDataById(id)
      } else {
        // 使用对象扩展运算符，拷贝对象，而不是引用
        // 否则新增一条记录后，defaultForm就变成了之前新增的值，我们需要每次打开新增界面都是空白的，以及打开修改界面时是相关的信息
        this.teacher = { ...defaultForm }
      }
    },
    // 新增或者修改的提交按钮
    saveOrUpdate() {
      this.saveBtnDisabled = true
      if (!this.teacher.id) {
        this.saveData()
      } else {
        this.updateData()
      }
    },
    // 新增
    saveData() {
      teacher.save(this.teacher).then(response => {
        return this.$message({
          type: 'success',
          message: '保存成功！'
        })
      }).then(response => {
        this.$router.push({ path: '/edu/teacher' })
      }).catch((response) => {
        this.$message({
          type: 'error',
          message: '保存失败'
        })
      })
    },
    // 根据id获取详情
    fetchDataById(id) {
      teacher.getById(id).then(response => {
        this.teacher = response.data.item
      }).catch((response) => {
        this.$message({
          type: 'error',
          message: '获取数据失败'
        })
      })
    },
    // 更新
    updateData() {
      this.saveBtnDisabled = true
      teacher.updateById(this.teacher).then(response => {
        return this.$message({
          type: 'success',
          message: '修改成功！'
        })
      }).then(response => {
        this.$router.push({ path: '/edu/teacher' })
      }).catch((response) => {
        this.$message({
          type: 'error',
          message: '保存失败'
        })
      })
    },
    // 上传成功后的回调函数
    cropSuccess(data) {
      this.imagecropperShow = false
      this.teacher.avatar = data.url
      this.imagecropperKey = this.imagecropperKey + 1
    },
    // 关闭上传组件
    close() {
      this.imagecropperShow = false
      this.imagecropperKey = this.imagecropperKey + 1
    }

  }

}
</script>
